logo

Expression of type Lambda

from the theory of proveit.numbers.division

In [1]:
import proveit
# Automation is not needed when building an expression:
proveit.defaults.automation = False # This will speed things up.
proveit.defaults.inline_pngs = False # Makes files smaller.
%load_expr # Load the stored expression as 'stored_expr'
# import Expression classes needed to build the expression
from proveit import Conditional, Lambda, a, x, y
from proveit.logic import And, Equals, InSet, NotEquals
from proveit.numbers import Complex, frac, zero
In [2]:
# build up the expression from sub-expressions
expr = Lambda([a, x, y], Conditional(Equals(frac(x, a), frac(y, a)), And(InSet(a, Complex), InSet(x, Complex), InSet(y, Complex), Equals(x, y), NotEquals(a, zero))))
expr:
In [3]:
# check that the built expression is the same as the stored expression
assert expr == stored_expr
assert expr._style_id == stored_expr._style_id
print("Passed sanity check: expr matches stored_expr")
Passed sanity check: expr matches stored_expr
In [4]:
# Show the LaTeX representation of the expression for convenience if you need it.
print(stored_expr.latex())
\left(a, x, y\right) \mapsto \left\{\frac{x}{a} = \frac{y}{a} \textrm{ if } a \in \mathbb{C} ,  x \in \mathbb{C} ,  y \in \mathbb{C} ,  x = y ,  a \neq 0\right..
In [5]:
stored_expr.style_options()
no style options
In [6]:
# display the expression information
stored_expr.expr_info()
 core typesub-expressionsexpression
0Lambdaparameters: 1
body: 2
1ExprTuple29, 27, 28
2Conditionalvalue: 3
condition: 4
3Operationoperator: 22
operands: 5
4Operationoperator: 6
operands: 7
5ExprTuple8, 9
6Literal
7ExprTuple10, 11, 12, 13, 14
8Operationoperator: 16
operands: 15
9Operationoperator: 16
operands: 17
10Operationoperator: 20
operands: 18
11Operationoperator: 20
operands: 19
12Operationoperator: 20
operands: 21
13Operationoperator: 22
operands: 23
14Operationoperator: 24
operands: 25
15ExprTuple27, 29
16Literal
17ExprTuple28, 29
18ExprTuple29, 26
19ExprTuple27, 26
20Literal
21ExprTuple28, 26
22Literal
23ExprTuple27, 28
24Literal
25ExprTuple29, 30
26Literal
27Variable
28Variable
29Variable
30Literal